stover



(No Model.)

. 2 Sheets'----i%heet I.. D. O. STOVER 8; F. W. HOEFER.

DRILLING MACHINE.

No. 542,695. Paten tedJuly 16, 38%.;

DANIEL o; srovnn AND mama; W- HOEFER, orrnsnrosnqnrsnoisj ASSIGNORS orus srovnn NOVELTY woanaor SAME PLACE.

omLtiNc wiAci-una srscrrrcn'rronrrmhin part'of Letters EateI'ihNoteases, dated July re, 1895.

Application filed June 13,1894, Serial lilo-515483. (l omodehl To all whom it may concern: Be it known that we, DANIEL have'in'vented acertain' new and useful 1m} provement in Drilling-Machines, of which the following is a specification. Our invention relates to the class of drill-- ing-machines commonly known as sensi:

t ive drills and it consists of certain new and useful features of construction and combine-P tions of parts, hereinafter fully described, and 1 specifically pointed out in the claims.

. .The {ylaten-lifti ng and .friction-plate-supQ portingdevices shownherein, are also shown and claimed in a pending application filed by us in the United Statesiatent Ofiice' December 2.6, 1893, having Serial No. 494,665.

Referring to the accompanying drawings,

' which form a part of this specification, Figure 1 is a side elevation of the drill, partly in central vertical section. Figs. 2 and 3 are horizontal sections'at the dotted lines 2 and 3, re-

spectively, in Fig. ref parts there shown.

Likeleltt'ers of reference indicate corresponding parts throughout the-three views.

A-is thecolumn of the machine-frame.

A','A and A are trifurcations integral with the column A and provided with bearings A, A and A at their free-ends for'supporting parts to-bedescrihed hereinafter.

B is a plateu hracket extending through the slot A in the/column A, wherein it is vertiw B 115 are bearings forapart to be described hereinafter. 0 is a ratch of suitable diameter to be easily passed through-the opening B in the platenbmcket B. r i

I D is a slidingdetent mounted in the hear-v ings B B actuated by and normally held 'into engagement withany of the interdental spaces in'the ratch O byfthe spring D. V

0'. Scrovnn and FREDERICK W. HOEFER, citizens of the United States, residing at Freeport, in the county of Stephensonaud State of Illinois,

ratchO.

E is a rack connected 'with'the Patch 0 and D is a pin passed transversely th-goh-ghthe 'free endof the detent'D toserve'asjtahandle by which to disengage the-latter fromth'e forming an upwardprolongationjthereof. f

F is a pinion mountedontheprojection A I meshing with the rack Ea'ha-vingja portionot its periphery F'gF? constructed without 'te'ethfl and fastened intoa earn.

G is a spindle-supporting arini pivot-jointed? to the column at G, having ah ori'z ontalij G is a locking-pin adantedto-he {freely socket G in the free end thereof, and; being" provided with an adjusting-screwfi flpassing therethrough; furnished with s eaer et the arm G into a slot G thhreixiynorrnally," H actuated by a spring G and'-pro\z ided with;

a thumb-push G forpressing itf into its socket G against theactijon ofthe springfGl. H is a spinglledriving shaft having free endwise-reciprocatory motion inthevertical hearing A, mounted hy rnean'sjot' the friction ff disk H on such bearing, andprovideda't it's lower end coupling.

H is a turret rotatably mounted oni th'e f v column A, and having any desired number I of radial horizontal arms H4, provided with vertical spindle --bearings, one "thereof H? carrying a drill-spindle H furnishedfat its upp r n t Qnememhe P af s hi -coupling--.the counterpart of the member H -at its lower end with a'drill and adapted to be engaged by the bifurcated por-' tion G of thelockiug pin G5, which performs,

. N withitsco'nnect1ons,.the function'or locking V the turret H sothat one memher 'Hof the friction coupling device will be concentric 2 with its counterpart member 11 Thejpart G together with the parts operating it, also performs an additionaliand vital junction i Aimee;

111B; 53 inw'ai" 0 n; T 4 m m. iuiiy muimmd in the slid in mag-Mags th s 0f the arm along the pr-ojaatiug gortisn J of the 23, where-- ii. irev'oii'ea by z'eass n of a spiiue cormew miussat into a; coimier'nwt gm- ;lie hub of the :irzeticm I Kiss, 3 92445 lie-stat, one and to the annulus Zjfiandmiapied to slide in two iika am; 011px) Ifmm twin-side m? time iiico tin; ways L 12 3 18376; ga -ejecting from mgidiy csnnwieai wiik the pin-ion E a-aid pe'siarms thieuezn its-$Qunegtiws-the parts LB, 1', G G, G, H, ER and- H ihe (Zambia fuizcizinn of regulating iha pi -tan B- by missing zmfii 10wering the same aaii mainaainigg ma iris 1216 Wax-k drilled;

-* The yiaier. a-y be so a'igjiis'ted as m 'afiapt iii-ta rewiva war at any fiissir-ad iihieb mess by diseggagiag ii e date-Q's. F3 ii ififii' m ratch C, aim-maid Fitifiiig ur Envy airing ih same, as the) sa e yequim mi men permitting the (latent D to re--angage its ratah.

O, and whenever tile p'iaten B law and i1; is dash-ad i0 miss i210 same, the QPQYMDY m; s'ugiport it, with we band and with His 0th. press the lever L toward we @0121 mm A, which, operating; th ougil, tins rack 25m! pinien E .1 will push iha rate-i2 Q dawnwm'fi through the vopening B in aim platen-bracket B, when a;

reve'rse ins-2011 of the lavm wi'ii. wisethe and imitation 0f on; inva'r itio'n. are as foiiowkz Sugrgosing m1 pawis of the mzmhine is be in the yiisiflona shown in Fig. 1, rind U throwing the .iaitea' 12:20 maintaining it in engagement with the fsict-imwwhes J.

Sil nuitgmemlsly with this operations just; de-

811666. thereof with one hand by turning scribad the stud I passaa upward frem the less eievatefi pm'tion F 10 the more elevated port'mn F of the cam on aim pinion Fflhsreby causing the spindie-supporting arm G in 'srzwei upward until it, will narmaily maintain mo friction-disk H zhmugh the meciia of we,

parts G H H H in engagement with the friction-ivheahi ithout reference "to the upward pressure at the werk M againstthe point of the) drill H O in using the machine, it will be found that the upward presauve of the wnrk M against aha paint; of the d'rillH will always be sufficiently great to foxes the friction-disk H upwm'ci andsligiltiy out of contact; with ii;sbearing N on the upperend of the part A excapn when the point 0f the drii'i H strikes asa l-heie omther cavityiu the wqrk being (Irina-6,521 which event the drill H driil-spimila Eli, frictiowcoupliugs H 11 shaft H, mm.- frieticn disiz H would fiescend sufiiciently to. braid; the engagement existing batsmen, tbs latter and the frictiQn-wheei J and. as a rss lli the (Zriii' fi 'wouid inmmiy seam revalving were it mi: for the baaring pirnvided by the upper? aida 01'? time, Him-2:24am pawiaian G of the 1neking-pin G which wiii stiii maintain ihi'migh the meiiia 0f the paris HTH? mm H, the fiiction-iisk H friciiem wheel 5 in apemtive contact until the point of the drili H shail have passed downward thmngh am am1dh0 a m: uihey: cavity and came in mmtaco with the soliu metal when upward pressura of the work 3.5; dust the point 0f the drill "H wiii again foma iii-iiispindle H ancithe friction-dial: E. thyoagh 11h air iniermediate cannectiws 12 an that the latter wiil ha out of 2011mm; wii; m h m. ing N m). the ,gart A, am; 5 8 functions at cam porzion 0f the pinion F, atud I, and spinc'lis-au gpsrtipg-arm G wiii beaome anal snswnded until the paint of the drill H aha again emanate: a sand-1101a m ctlaei mviiiy in tha wurk. same other i001 than the driii Hflth'a 6p tor will press Lha thumb-push G iuward mini! the bifm' ated pardon G 02' 6M; making-pin G" is so far out: of angagemam :iw (iriib aphids H that. the turret fi amn be 'revfiived until {he i'equiaite spinfiie, 9.5 Q, i, cama ints engagement with me leek"Eng;- m; G, which engagement will automatiflaiiy izziia 932130 by virtue of the hawk; G ins-wan. From iz'tie jiEustmtic-n just given it will as seen am all. the varimxs tc-als {zmtsl'wv-sn} em 'ried the turret H r-my be operaii-vaiy and smedily-connested witiz the di-iving-sizaf H of the ii-iii.

In this machine aha frietionai. @Q'fitfsfit Em tween iha friction-disk ll anal the, fristiaza- Siigiit movements cf the plaiez.

veer L wili automaticmiy start; am! stapifae same. Its operator: can quiekiy file XCO thumb-screw K and sliding the yoke K andfriction-wheel J 2 thereby and afterward tightening the same. y

1. In a drilling-machine, in combination, a column,adri1l-spindle driving-shaftprovided, at its upper end, with a friction dx-ivingdevice, at its lower end, with one, member of a friction-coupling, a rotatably-mounted turret, having radial arms furnished with spindlebearings carrying spindles, each provided, at its upper end, with a counterpart member of said, friction-coupling, the spindle-supporting-arm provided, at its free end, with means of connection with the drill '-spindles, and means for operating the spindle-supportingarm, wherethrough the members of the trio lion-driving and friction-coupling devices may be maintained in operative connection independently of the application of upward pressure to the point of the drill-spindle by work on the platen, substantially as and for the purpose specified.

2. In a drilling-machine, in combination, a colu mn, a drill-spindle driving-shaft provided, at its upper end, with a friction driving-device, at its lower end, with one member of a friction-coupling, a rotatably-mounted turret, having radial arms furnished with spindlebearings carrying spindles, each provided, at itsupper end, witha counterpart member of said friction-coupling, the locking-pin, the

.spindle-supporting-arm, and means for operating the same, wherethrough the members of the friction-driving and friction-coupling devices may be maintained in operative connection independently of the application of upward pressure to the point of the drillspindle by Work on the platen, substantially as and for the purpose specified.

DANIEL C. STOVER. FREDERICK \V. IIOEFER.

Witnesses; i L. S. JOHNSON,

L. L. MORRISON. 

